Hangzhou Huaxing Kechuang Holding Group Co., Ltd. is one of the leading manufacturers and suppliers of spindle bearing s7008cdgap4a in China. As we have world-leading production equipment and strong manufacturing capabilities, we warmly welcome you to buy bulk high quality bearings at competitive price from our factory.
Technical Data
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Dimension (mm): |
40*68*15 |
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Tolerance for inside-Ø (mm): |
0/-0,006 |
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Tolerance for outside-Ø (mm): |
0/-0,007 |
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Tolerance for width (mm): |
0/-0,12 |
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Tolerance for shaft da (mm): |
0,25/-0,25 |
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Cr (N): |
12500 |
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Cor (N): |
9100 |
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Contact Angle: |
15° |
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Rows Of Balls: |
Single Row |
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Seal: |
NBR |
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Ring Material: |
GCr15, 100Cr6, SUJ2, X30 |
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Rolling Element Material: |
GCr15 (G5) |
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Cage Material: |
Phenolic Resin |
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Tolerance Class: |
P4S |
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Lubrication: |
Greased with Lubcon L252 |
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RPM: |
28000 |
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Product weight: |
0.185kg |
Features
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1. Superior Unidirectional Composite Load Resistance. Optimized for sustaining high radial and single-directional axial loads, the all-steel ball rolling body features higher structural compactness and impact resistance. Unlike ceramic ball bearings that prioritize lightweight and low friction, steel rolling bodies provide stronger bearing capacity for instantaneous impact loads and heavy continuous loads, avoiding the brittleness risk of ceramic balls under heavy pressure and impact.
2. Strict High-Precision Grade Control. It supports multiple high precision grades including P2/P4S/P4/P5. With matched steel ball precision screening and ultra-fine raceway grinding process exclusive to steel ball structures, it achieves ultra-low runout and high rotational accuracy. It maintains long-term precision stability under heavy-load working conditions, solving the problem that ceramic ball bearings are prone to precision deviation after long-term heavy-load impact.
3. Optimized Speed Adaptation for Conventional High-Speed Working Conditions. Equipped with 15° and 25° contact angle specifications, paired with a dedicated custom cage and exclusive internal structural optimization for steel ball layouts. It realizes stable and reliable high-speed operation under standard lubrication conditions. Different from ultra-high-speed-oriented ceramic ball bearings, this steel ball structure balances speed performance and structural durability, delivering more stable operation and longer service life in medium and conventional high-speed continuous working scenarios.
4. Enhanced Heavy-Load Rigidity and Deformation Resistance. Designed for paired mounting modes including DB/DT/QBC with standardized preload configuration to eliminate internal clearance thoroughly. The all-steel ball matching structure features higher integral structural rigidity and better pressure uniformity under cutting force load. Compared with hybrid ceramic bearings, it shows weaker elastic deformation under heavy cutting load and strong mechanical impact, ensuring excellent spindle operation stability in heavy cutting and rough machining processes.
5. Integrated Sealed Steel Ball Structural Reliability. The integrated sealing structure matched with steel ball rolling bodies effectively isolates dust, cutting fluid and impurities in conventional machining environments. It avoids the poor sealing adaptability and abnormal wear problems easily caused by the different thermal expansion coefficients of ceramic and steel materials in hybrid bearings, reducing failure risks such as impurity jamming and abnormal noise, and lowering daily maintenance costs.
Applications
Tailored to medium and high-precision machining scenarios focusing on heavy load, strong impact and cost-effective stable operation (excluding ultra-high-speed extreme working conditions applicable to hybrid ceramic bearings), this sealed steel ball spindle bearing is widely applied in scenarios requiring high load-bearing capacity and long-term operational stability:
1. Heavy-duty CNC machine tool spindles, conventional machining center spindles, and precision lathe spindles for heavy cutting, rough machining and continuous batch machining.
2. Medium-high speed grinding equipment, general-purpose precision mechanical spindles and industrial automation precision rotating components with high radial and unidirectional axial load requirements.
3. Precision mechanical equipment that requires high rigidity, low deformation and long-term stable precision operation under conventional lubrication and ordinary industrial environmental conditions.
4. Cost-sensitive high-precision rotating systems that do not need ultra-high-speed performance but pursue high load resistance and structural durability.
Advantages
HXB was founded in 1995, with nearly 30 years of dedicated development, HXB now operates6 subsidiaries.
∗ 2 high-tech R&D centers
∗ 2 modern manufacturing factories - Hangzhou Yijia Precision Bearing Co., Ltd. and Zhejiang Ruiyang Bearing Technology Co., Ltd.
∗ Supported by advanced digital MES and SPC management systems
∗ IATF16949:2016, ISO9001:2015 and ISO14001 certifications
∗ High-end equipment and high-quality material
About HXB
1. Hangzhou Factory - YJB
Founded in June 2007, YJB is located in Hangzhou. As a subsidiary of HXB Group, we are a national high-tech enterprise and provincial science & technology enterprise specializing in R&D and manufacturing of high-precision, high-speed, advanced, special and professional bearings.
Core Capabilities & Intelligent Manufacturing
- Product Size: Inner diameter Φ3–Φ300mm
- Precision Classes: P2, P4 (ultra-precision grades)
- Annual Capacity: 3 million sets of precision bearings in a lean & intelligent factory
- Equipment Investment: Over RMB 3 million in world-leading precision testing instruments
- Digital Transformation: with full deployment of MESYS bearing design platform, ERP, MES, WMS, SPC real-time quality monitoring and OA systems, building a benchmark smart manufacturing plant.
Main Products
Precision Spindle Bearings
Angular Contact Ball Bearings
Servo Motor Bearings
Vacuum Pump Bearings
Ball Screw Support Bearings
2. Huzhou Factory
In 2021, the deep groove ball bearing factory relocated from Hangzhou to Huzhou. It operate in a 10,000㎡ production facility with a team of 75 employees, focused on the R&D, and manufacturing of high-performance deep groove ball bearings.
We maintain a professional engineering and quality system to ensure stable precision and reliability.
Engineering Team: 4 bearing design & process engineers, accounting for 5% of staff.
Quality Team: 15 quality personnel, including 2 quality engineers, 20% of staff, covering incoming inspection, in-process control and final testing.
Product Range
Series: 6000–6024, 6200–6214, 6300–6314, 6800–6824, 6900–6924
Features: High rigidity, low noise; suitable for grease lubrication or oil-mist lubrication.
6 Series X4YA-2RS (Double-lip seal) & APT Retainer Series
Features: High & low temperature resistance, superior sealing, high load capacity, long service life.
Application: New energy vehicle transmission systems.
Certificates
Exhibition
FAQ
Q3: Why can sealed full steel ball bearings maintain higher rigidity under cutting force?
A3: It adopts DB/DT/QBC paired mounting and preload design to completely eliminate internal clearance. Meanwhile, the consistent material and integrated matching of all-steel rolling bodies and steel raceways realize uniform stress distribution. Different from hybrid ceramic bearings with different material properties of rolling bodies and raceways, the all-steel structure has better overall structural rigidity, smaller elastic deformation under strong cutting force and mechanical impact, and more stable spindle operation.
Q4: Are sealed steel ball spindle bearings inferior in speed performance to hybrid ceramic bearings?
A4: Not in conventional working conditions. Matched with 15°/25° optimized contact angles and a special customized cage, this bearing achieves excellent stable high-speed performance suitable for most industrial precision machining. It does not pursue the extreme ultra-high-speed limit of ceramic bearings, but realizes a more balanced performance of speed, stability and service life. It avoids the problem that hybrid ceramic bearings are easy to have precision attenuation under long-term heavy-load speed operation.
Q5: What are the advantages of this sealed steel ball structure in terms of environmental adaptability and maintenance?
A5: The integrated sealing structure perfectly matches the all-steel ball structure with consistent thermal expansion coefficient, which can effectively block cutting fluid, dust and machining impurities. Unlike hybrid bearings that are prone to seal gap changes and abnormal wear due to different thermal expansion of dissimilar materials, this product has stable sealing performance, low failure rate of impurity jamming and abnormal noise, and greatly reduces later maintenance frequency and use cost.
Q6: What precision grades are available for this sealed steel ball spindle bearing?
A6: It supports multiple high-precision grades including P2/P4S/P4/P5. Relying on exclusive steel ball precision screening technology and ultra-fine raceway grinding process, it maintains long-term precision stability under heavy-load working conditions, which makes up for the defect that hybrid ceramic bearings are easy to have precision deviation after long-term heavy impact.
Q: Where are your goods mainly exported to?
A: Our products are mainly exported to the United States, Japan, South Korea, India and other countries. The main customers are Siemens, JOHN-DEER, HUSQVARNA, FEDERAL-MOGUL.
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